Application of Polymeric Super Electrical Insulating Materials to Superconducting Power Apparatus

高分子超电绝缘材料在超导电力设备中的应用

• 批准号: 08455133
• 负责人: KOSAKI Masamitsu
• 金额: $ 4.54万
• 依托单位: TOYOHASHI UNIVERSITY OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455133/
• 关键词: ethylene-propylene rubber; performance of electrical insulation; treeing resistance; cryogenic electrical insulation; space charge; filler; cryogenic power apparatus; super electrical insulation; 極低温領域; 絶縁破壊特性

The investigators have been studying the application of polymeric materials (ethylene-propylene rubber (EPR)) to electrical insulation system of superconducting power apparatus. The superconducting power apparatus is the promising ways for handling huge electric power efficiently in the future. It is necessary to study the behavior of electrical insulation at cryogenic temperature to evaluate long term reliability as a superconducting apparatus. At cryogenic temperature, there are many practical insulation studies on fluids such as liquid nitrogen or liquid helium but scarce studies on the solid insulation enabling a high voltage design.The results are summarized as follows :(1) The treeing phenomena of EPR insulation at cryogenic temperature have been studied. DC short-circuit treeing tests are performs. DC short-circuit tree initiation voltage at cryogenic temperatures in much higher than that at room temperatures. This may be attributed to loss carrier injection from electrode and gives a strong incentive to design the electrical insulation of superconducting power apparatus.(2) The effect of additives such as crosslinking agent and fillers on tandelta, dielectric dissipation factor of EPR have been measured at cryogenic temperature. The results show that additives increase tandelta of relatively thin films of EPR even in cryogenic temperature region.(3) To design the electrical insulation for a superconducting power apparatus the DC.breakdown voltage of cryogenic gas with and without spacer have been measured. The breakdown voltageobeys Paschen''s law and change only with the product of density and thickness. In low density-thickness product range surface breakdown can hardly occur before the gap breakdown develops.The results obtained in this study open an avenue to the application of polymeric materials (EPR) to electrical insulation system of superconducting power apparatus. EPR seem to be promising materials for solid insulation in the cryogenic region.

研究人员一直在研究聚合物材料（乙丙橡胶（EPR））在超导电力装置电气绝缘系统中的应用。超导电力装置是未来高效处理巨大电力的有前途的方法。为了评估超导装置的长期可靠性，有必要研究低温下的电绝缘性能。在低温下，对液氮、液氦等流体的绝缘研究较多，但对固体绝缘的研究较少，主要研究结果如下：（1）研究了低温下EPR绝缘的树枝化现象。进行了直流短路树枝化试验。低温下的直流短路树起始电压比室温下的高得多。这可能归因于电极的损耗载流子注入，并为超导电力设备的电绝缘设计提供了强有力的激励。(2)在低温条件下，测定了交联剂、填料等添加剂对EPR材料的介电损耗、介电损耗因子的影响。结果表明，即使在低温区，添加剂也能提高EPR薄膜的tan δ。(3)为了设计超导电力设备的电绝缘，测量了有、无隔离层时低温气体的直流击穿电压。击穿电压服从帕邢定律，只随密度和厚度的乘积而变化。在低密度-厚度积范围内，在差距击穿发展之前，几乎不会发生表面击穿，这为聚合物材料（EPR）在超导电力设备电绝缘系统中的应用开辟了一条途径。EPR是一种很有前途的低温固体绝热材料。

项目成果

KOSAKI Masamitsu: "Research and Development of Electrical Insulation of Superconducting Cables by Extruded Polymers" IEEE Electrical Insulation Magazine. 12・5. 17-24 (1996)

小崎正光：“挤压聚合物超导电缆的电气绝缘研究与开发”IEEE电气绝缘杂志12・5（1996）。

MINODA Astushi: "AC Treeing of Ethylene-Propylene Rubber in Cryogenic Temperature Region" Trans.Inst.Elec.Eng.Japan. Vol.117, No.6. 614-620 (1997)

MINODA Astushi：“低温区域乙丙橡胶的 AC Treeing” Trans.Inst.Elec.Eng.Japan。

小さき正光: "超伝導機器の電気絶縁技術の今" 電気学会誌. 116巻6号. 339-342 (1996)

小正光：“超导设备电气绝缘技术的现状”，日本电气工程师学会杂志，第 116 卷，第 6 期，339-342（1996 年）。

MINODA Atsushi: "DC Short-Circuit Treeing Phenomenon and Space Charge Effect of EPR at Cryogenic Temperature" Proceedings of 5^<th> ICPADM (IEEE 97CH35794). Vol.1. 426-429 (1997)

MINODA Atsushi：“低温下 EPR 的直流短路树现象和空间电荷效应”第 5 届 ICPADM 论文集 (IEEE 97CH35794)。

MINODA Astushi: "Feasibility Study of Extruded Polymer Insulated DC Superconducting Cable" Proceedings of 10^<th> ISH. Vol.2. 117-120

MINODA Astushi：“挤出聚合物绝缘直流超导电缆的可行性研究”第 10 届 ISH 会议记录。